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Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/libsupc++/unwind-cxx.h')
| -rw-r--r-- | gcc-4.4.3/libstdc++-v3/libsupc++/unwind-cxx.h | 412 |
1 files changed, 412 insertions, 0 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/libsupc++/unwind-cxx.h b/gcc-4.4.3/libstdc++-v3/libsupc++/unwind-cxx.h new file mode 100644 index 000000000..1420db368 --- /dev/null +++ b/gcc-4.4.3/libstdc++-v3/libsupc++/unwind-cxx.h @@ -0,0 +1,412 @@ +// -*- C++ -*- Exception handling and frame unwind runtime interface routines. +// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 +// Free Software Foundation, Inc. +// +// This file is part of GCC. +// +// GCC is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 3, or (at your option) +// any later version. +// +// GCC is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +// This is derived from the C++ ABI for IA-64. Where we diverge +// for cross-architecture compatibility are noted with "@@@". + +#ifndef _UNWIND_CXX_H +#define _UNWIND_CXX_H 1 + +// Level 2: C++ ABI + +#include <typeinfo> +#include <exception> +#include <cstddef> +#include "unwind.h" +#include <bits/atomic_word.h> + +#pragma GCC visibility push(default) + +namespace __cxxabiv1 +{ + +// A primary C++ exception object consists of a header, which is a wrapper +// around an unwind object header with additional C++ specific information, +// followed by the exception object itself. + +struct __cxa_exception +{ + // Manage the exception object itself. + std::type_info *exceptionType; + void (*exceptionDestructor)(void *); + + // The C++ standard has entertaining rules wrt calling set_terminate + // and set_unexpected in the middle of the exception cleanup process. + std::unexpected_handler unexpectedHandler; + std::terminate_handler terminateHandler; + + // The caught exception stack threads through here. + __cxa_exception *nextException; + + // How many nested handlers have caught this exception. A negated + // value is a signal that this object has been rethrown. + int handlerCount; + +#ifdef __ARM_EABI_UNWINDER__ + // Stack of exceptions in cleanups. + __cxa_exception* nextPropagatingException; + + // The nuber of active cleanup handlers for this exception. + int propagationCount; +#else + // Cache parsed handler data from the personality routine Phase 1 + // for Phase 2 and __cxa_call_unexpected. + int handlerSwitchValue; + const unsigned char *actionRecord; + const unsigned char *languageSpecificData; + _Unwind_Ptr catchTemp; + void *adjustedPtr; +#endif + + // The generic exception header. Must be last. + _Unwind_Exception unwindHeader; +}; + +struct __cxa_refcounted_exception +{ + // Manage this header. + _Atomic_word referenceCount; + // __cxa_exception must be last, and no padding can be after it. + __cxa_exception exc; +}; + +// A dependent C++ exception object consists of a wrapper around an unwind +// object header with additional C++ specific information, containing a pointer +// to a primary exception object. + +struct __cxa_dependent_exception +{ + // The primary exception this thing depends on. + void *primaryException; + + // The C++ standard has entertaining rules wrt calling set_terminate + // and set_unexpected in the middle of the exception cleanup process. + std::unexpected_handler unexpectedHandler; + std::terminate_handler terminateHandler; + + // The caught exception stack threads through here. + __cxa_exception *nextException; + + // How many nested handlers have caught this exception. A negated + // value is a signal that this object has been rethrown. + int handlerCount; + +#ifdef __ARM_EABI_UNWINDER__ + // Stack of exceptions in cleanups. + __cxa_exception* nextPropagatingException; + + // The nuber of active cleanup handlers for this exception. + int propagationCount; +#else + // Cache parsed handler data from the personality routine Phase 1 + // for Phase 2 and __cxa_call_unexpected. + int handlerSwitchValue; + const unsigned char *actionRecord; + const unsigned char *languageSpecificData; + _Unwind_Ptr catchTemp; + void *adjustedPtr; +#endif + + // The generic exception header. Must be last. + _Unwind_Exception unwindHeader; +}; + +// Each thread in a C++ program has access to a __cxa_eh_globals object. +struct __cxa_eh_globals +{ + __cxa_exception *caughtExceptions; + unsigned int uncaughtExceptions; +#ifdef __ARM_EABI_UNWINDER__ + __cxa_exception* propagatingExceptions; +#endif +}; + + +// The __cxa_eh_globals for the current thread can be obtained by using +// either of the following functions. The "fast" version assumes at least +// one prior call of __cxa_get_globals has been made from the current +// thread, so no initialization is necessary. +extern "C" __cxa_eh_globals *__cxa_get_globals () throw(); +extern "C" __cxa_eh_globals *__cxa_get_globals_fast () throw(); + +// Allocate memory for the primary exception plus the thrown object. +extern "C" void *__cxa_allocate_exception(std::size_t thrown_size) throw(); + +// Free the space allocated for the primary exception. +extern "C" void __cxa_free_exception(void *thrown_exception) throw(); + +// Allocate memory for a dependent exception. +extern "C" __cxa_dependent_exception* +__cxa_allocate_dependent_exception() throw(); + +// Free the space allocated for the dependent exception. +extern "C" void +__cxa_free_dependent_exception(__cxa_dependent_exception *ex) throw(); + +// Throw the exception. +extern "C" void __cxa_throw (void *thrown_exception, + std::type_info *tinfo, + void (*dest) (void *)) + __attribute__((noreturn)); + +// Used to implement exception handlers. +extern "C" void *__cxa_get_exception_ptr (void *) throw(); +extern "C" void *__cxa_begin_catch (void *) throw(); +extern "C" void __cxa_end_catch (); +extern "C" void __cxa_rethrow () __attribute__((noreturn)); + +// These facilitate code generation for recurring situations. +extern "C" void __cxa_bad_cast (); +extern "C" void __cxa_bad_typeid (); + +// @@@ These are not directly specified by the IA-64 C++ ABI. + +// Handles re-checking the exception specification if unexpectedHandler +// throws, and if bad_exception needs to be thrown. Called from the +// compiler. +extern "C" void __cxa_call_unexpected (void *) __attribute__((noreturn)); +extern "C" void __cxa_call_terminate (void*) __attribute__((noreturn)); + +#ifdef __ARM_EABI_UNWINDER__ +// Arm EABI specified routines. +typedef enum { + ctm_failed = 0, + ctm_succeeded = 1, + ctm_succeeded_with_ptr_to_base = 2 +} __cxa_type_match_result; +extern "C" bool __cxa_type_match(_Unwind_Exception*, const std::type_info*, + bool, void**); +extern "C" void __cxa_begin_cleanup (_Unwind_Exception*); +extern "C" void __cxa_end_cleanup (void); +#endif + +// Invokes given handler, dying appropriately if the user handler was +// so inconsiderate as to return. +extern void __terminate(std::terminate_handler) __attribute__((noreturn)); +extern void __unexpected(std::unexpected_handler) __attribute__((noreturn)); + +// The current installed user handlers. +extern std::terminate_handler __terminate_handler; +extern std::unexpected_handler __unexpected_handler; + +// These are explicitly GNU C++ specific. + +// Acquire the C++ exception header from the C++ object. +static inline __cxa_exception * +__get_exception_header_from_obj (void *ptr) +{ + return reinterpret_cast<__cxa_exception *>(ptr) - 1; +} + +// Acquire the C++ exception header from the generic exception header. +static inline __cxa_exception * +__get_exception_header_from_ue (_Unwind_Exception *exc) +{ + return reinterpret_cast<__cxa_exception *>(exc + 1) - 1; +} + +// Acquire the C++ refcounted exception header from the C++ object. +static inline __cxa_refcounted_exception * +__get_refcounted_exception_header_from_obj (void *ptr) +{ + return reinterpret_cast<__cxa_refcounted_exception *>(ptr) - 1; +} + +// Acquire the C++ refcounted exception header from the generic exception +// header. +static inline __cxa_refcounted_exception * +__get_refcounted_exception_header_from_ue (_Unwind_Exception *exc) +{ + return reinterpret_cast<__cxa_refcounted_exception *>(exc + 1) - 1; +} + +static inline __cxa_dependent_exception * +__get_dependent_exception_from_ue (_Unwind_Exception *exc) +{ + return reinterpret_cast<__cxa_dependent_exception *>(exc + 1) - 1; +} + +#ifdef __ARM_EABI_UNWINDER__ +static inline bool +__is_gxx_exception_class(_Unwind_Exception_Class c) +{ + // TODO: Take advantage of the fact that c will always be word aligned. + return c[0] == 'G' + && c[1] == 'N' + && c[2] == 'U' + && c[3] == 'C' + && c[4] == 'C' + && c[5] == '+' + && c[6] == '+' + && (c[7] == '\0' || c[7] == '\x01'); +} + +// Only checks for primary or dependent, but not that it is a C++ exception at +// all. +static inline bool +__is_dependent_exception(_Unwind_Exception_Class c) +{ + return c[7] == '\x01'; +} + +static inline void +__GXX_INIT_PRIMARY_EXCEPTION_CLASS(_Unwind_Exception_Class c) +{ + c[0] = 'G'; + c[1] = 'N'; + c[2] = 'U'; + c[3] = 'C'; + c[4] = 'C'; + c[5] = '+'; + c[6] = '+'; + c[7] = '\0'; +} + +static inline void +__GXX_INIT_DEPENDENT_EXCEPTION_CLASS(_Unwind_Exception_Class c) +{ + c[0] = 'G'; + c[1] = 'N'; + c[2] = 'U'; + c[3] = 'C'; + c[4] = 'C'; + c[5] = '+'; + c[6] = '+'; + c[7] = '\x01'; +} + +static inline bool +__is_gxx_forced_unwind_class(_Unwind_Exception_Class c) +{ + return c[0] == 'G' + && c[1] == 'N' + && c[2] == 'U' + && c[3] == 'C' + && c[4] == 'F' + && c[5] == 'O' + && c[6] == 'R' + && c[7] == '\0'; +} + +static inline void +__GXX_INIT_FORCED_UNWIND_CLASS(_Unwind_Exception_Class c) +{ + c[0] = 'G'; + c[1] = 'N'; + c[2] = 'U'; + c[3] = 'C'; + c[4] = 'F'; + c[5] = 'O'; + c[6] = 'R'; + c[7] = '\0'; +} + +static inline void* +__gxx_caught_object(_Unwind_Exception* eo) +{ + return (void*)eo->barrier_cache.bitpattern[0]; +} +#else // !__ARM_EABI_UNWINDER__ +// This is the primary exception class we report -- "GNUCC++\0". +const _Unwind_Exception_Class __gxx_primary_exception_class += ((((((((_Unwind_Exception_Class) 'G' + << 8 | (_Unwind_Exception_Class) 'N') + << 8 | (_Unwind_Exception_Class) 'U') + << 8 | (_Unwind_Exception_Class) 'C') + << 8 | (_Unwind_Exception_Class) 'C') + << 8 | (_Unwind_Exception_Class) '+') + << 8 | (_Unwind_Exception_Class) '+') + << 8 | (_Unwind_Exception_Class) '\0'); + +// This is the dependent (from std::rethrow_exception) exception class we report +// "GNUCC++\x01" +const _Unwind_Exception_Class __gxx_dependent_exception_class += ((((((((_Unwind_Exception_Class) 'G' + << 8 | (_Unwind_Exception_Class) 'N') + << 8 | (_Unwind_Exception_Class) 'U') + << 8 | (_Unwind_Exception_Class) 'C') + << 8 | (_Unwind_Exception_Class) 'C') + << 8 | (_Unwind_Exception_Class) '+') + << 8 | (_Unwind_Exception_Class) '+') + << 8 | (_Unwind_Exception_Class) '\x01'); + +static inline bool +__is_gxx_exception_class(_Unwind_Exception_Class c) +{ + return c == __gxx_primary_exception_class + || c == __gxx_dependent_exception_class; +} + +// Only checks for primary or dependent, but not that it is a C++ exception at +// all. +static inline bool +__is_dependent_exception(_Unwind_Exception_Class c) +{ + return (c & 1); +} + +#define __GXX_INIT_PRIMARY_EXCEPTION_CLASS(c) c = __gxx_primary_exception_class +#define __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(c) \ + c = __gxx_dependent_exception_class + +// GNU C++ personality routine, Version 0. +extern "C" _Unwind_Reason_Code __gxx_personality_v0 + (int, _Unwind_Action, _Unwind_Exception_Class, + struct _Unwind_Exception *, struct _Unwind_Context *); + +// GNU C++ sjlj personality routine, Version 0. +extern "C" _Unwind_Reason_Code __gxx_personality_sj0 + (int, _Unwind_Action, _Unwind_Exception_Class, + struct _Unwind_Exception *, struct _Unwind_Context *); + +static inline void* +__gxx_caught_object(_Unwind_Exception* eo) +{ + // Bad as it looks, this actually works for dependent exceptions too. + __cxa_exception* header = __get_exception_header_from_ue (eo); + return header->adjustedPtr; +} +#endif // !__ARM_EABI_UNWINDER__ + +static inline void* +__get_object_from_ue(_Unwind_Exception* eo) throw() +{ + return __is_dependent_exception (eo->exception_class) ? + __get_dependent_exception_from_ue (eo)->primaryException : + eo + 1; +} + +static inline void * +__get_object_from_ambiguous_exception(__cxa_exception *p_or_d) throw() +{ + return __get_object_from_ue (&p_or_d->unwindHeader); +} + + +} /* namespace __cxxabiv1 */ + +#pragma GCC visibility pop + +#endif // _UNWIND_CXX_H |